Question

0已知x的平方+（2y）的平方-4x+4y+5=0,求y/x?+y?的值0.0

Answer 1

x^2+(2y)^2-4x+4y+5=0

x^2-4x+4+(2y)^2+4y+1=0

(x-2)^2+(2y+1)^2=0

x-2=0 2y+1=0

x=2 y=-1/2

后面的自己带里就行,看不清